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Technical Service Bulletin

13 Starter/generator drive belt is noisy or came off - 2.0 ltr. inline 4-cyl. TFSI

Transaction No.: 2061461/15
Release date: Nov 19, 2025

Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
A4, AG, and Q5 2019 — 2025
2019
Aé allroad
2021 — 2025
Q5 e quattro 2020 — 2025
All 2.0 ltr. Inline 4-cyl. TFSI
Ad, and A5 Sportback 2021 — 2023
AS Cabriolet, and A7 e 2021 — 2022
quattro
Q5 Sportback 2021 — 2025
REVISION HISTORY
Revision | Date Purpose
15 - Revised service (added sentence)
14 09/26/2025 | Revised header (Update model year)
Revised Warranty (Updated service number)
13 06/27/2025 | Revised header (Updated model year)
Customer states:

¢ — There is a grinding/squeaking/tweeting noise coming from the engine compartment.

and/or

* Amessage in the driver information system (DIS) displays "Electrical system: Malfunction! Please go to

workshop" (if the poly V-belt has fallen off).

Workshop findings:

* The grinding/squeaking/tweeting noise is coming from the poly V-belt (alternator belt).

and/or

* The poly V-belt is damaged or has fallen off the wheel roller.

Technical Background

Deviation on the rollers of the belt tensioner.

Production Solution

Vehicle | Belt Tensioner Poly V-belt

A4/AS | WA19AAF48MA085698 | WAUZZZF54RA057164
(07/23/2021) (01/16/2024)

AG/A7 | WAUZZZF24NNO07843 | WAUZZZF2XSN046531
(07/22/2021) (03/24/2025)

Q5 WA1EAAFY1N2021046 | WA1EAAFY9R2100633
(09/23/2021) (04/30/2024)

Service

Scenario 1: Grinding, squeaking, or tweeting noises

1. Let the engine run at idle speed and assess the noise.
An example of the noise can be found in the following video:

https://audi-
external.kzoplatform.com/player/medium/1823282939031459668
(Figure 1).

Figure 1. QR code for supporting video.

2. For final confirmation of the source of the noise, spray the inside of the poly V-belt with a little tap water. One
spray blast out of a commercially available water spray bottle is enough. The noise should disappear as a result.

3. If the noise disappears after spraying with water, replace the poly V-belt and belt tensioner. If a new belt
tensioner has already been installed (in the workshop or after the production change), do not replace it
again.

Replacing the belt-driven starter-generator will not fix the problem.

Scenario 2: Poly V-belt damaged or fallen off

1. If the vehicle was manufactured before the production change, then the belt tensioner and poly V-belt must be
replaced. If a new belt tensioner has already been installed (in the workshop or after the production
change), do not replace it again.

Check for correct belt running alignment after poly V-belt and tensioner replacement as follows:
1. Run the engine at idle speed.

2. The belt must not protrude forward or backward over the roller edge of the tensioner (Figure 2, red marks).

A B Cc

Figure 2. Check to ensure that the poly V-belt is not protruding in either direction.
Explanation of Figure 2 (view from above into the engine compartment):
A= poly V-belt.

B = tensioning roller of the belt tensioner.

C = belt tensioner

©

Please ensure that the belt tensioner (including the retaining tab) is not damaged during removal.
Damage to the component would make analyzing the parts impossible. In such cases, we may charge
back the damaged parts.

Figure 3. Examples of damaged parts.

Warranty

Claim Type:

* If the vehicle is outside any warranty, this Technical Service Bulletin is informational

only.

Service Number:

1373

Damage Code:

* 0020 (Noisy belt)
* 0015 (Belt came off)

Labor Operations:

Ribbed belt remove + install

1372 19XX

See SRT with
associated operations

Belt tension damper remove + install

1373 19XX

See SRT with
associated operations

Check Poly V-Belt run alignment

1372 0199

10 TU

Claim Comment:

As per TSB 2061461/15

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures

Manual. Claims are subject to review or audit by Audi Warranty.

Additional Information

All part and service references provided in this TSB (2061461) are subject to change and/or removal.

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